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Finding the Fourth Proportional to 853.07, 1,278.72 and 442.40

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Solution

The fourth proportional to 853.07, 1,278.72 and 442.40 is: 663.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.07 : 1,278.72 = 442.40 : x
  2. Step 2: Convert to fraction form
    853.07/1,278.72 = 442.40/x
  3. Step 3: Cross multiply
    853.07x = 1,278.72 × 442.40
  4. Step 4: Simplify right side
    853.07x = 565,699.33
  5. Step 5: Solve for x
    x = 565,699.33/853.07
  6. Step 6: Final answer
    x = 663.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.